Allah the Almighty commands;
“… if you are ill or on a journey or one of you comes from the place of relieving himself or you have contacted women and do not find water, then seek clean earth and wipe over your faces and hands with it…” (Al-Ma’ida/The Feast 5:6)
This verse informs that ablution (wudu) is broken by activities that take place at the toilet. Since vaginal discharge is not one of those, it does not break the wudu. There is not a strong, or even weak, hadith; or a narration from The Companions of Prophet Muhammad, or from the people who talked to The Companions.